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iPhone and Macbook can't reach maximum internet speed via 5Ghz wifi in AX53U and AX1800HP

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seanars

New Around Here
So I have bought 3 routers, AX56U, AX53U, and AX1800HP

The problem is :
My iPhone 13 Pro and Macbook Pro 14 inch can achieve 250Mbps in AX56U, but stuck at 140-160Mbps in AX53U and AX1800HP
My Samsung Galaxy S10 and Galaxy Z Flip 4 can achieve 250Mbps in all routers (AX56U, AX53U, and AX1800HP)

I tried to configure the every settings combination by enabling and disabling the features, but still the problem persists... So my question is, why do my apple devices have a limited bandwidth and why does this problem only occur in AX53U and AX1800HP?

Please if anyone would like to share any opinions/suggestions/solutions, that would be much appreciated... (sorry for my bad english)

Several things to know related to my problem :
- All devices connected to 5 Ghz Wifi with dedicated SSID
- My rated internet speed from ISP is 250 Mbps
- Speed measurement done using speedtest.net
- Speed measurement done directly next to the router (to eliminate distance, interference factors, etc)
- There is no problem with the cables and/or wired connection
 

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